Synthgeek has released sg-modutron mini, a free synthesizer instrument for Windows.
This is a simple 1-oscillator synth based on “virtual circuit-bending”. The initial idea started out as an attempt at making a bass synth version of the APC synth. It turned out to be impossible to get it to track pitch at all, so more experimentation ensued, and this is the result. It does track pitch, but often sounds will change across the keyboard or possibly even stop making sound at a certain key.
Some of the ideas used here will doubtless be put to use in a larger multi-osc synth, though whether an expanded version of this exact synth will be developed remains to be seen.
sg-modutron mini is available to download as a freeware VST instrument for Windows PC.